Yes, there are several models and methods available to calculate how groundwater distributes spatially. These include the analytical element method (AEM), finite element method (FEM), groundwater flow model (GWM), and the Darcy-Weisbach equation. Each of these methods have their own advantages and disadvantages and can be used to accurately model groundwater flow in different scenarios.

It is difficult to say whether dyslexia existed prior to written language, as the condition is associated with difficulties in reading and writing. It is possible that some symptoms of dyslexia may have been present in individuals without any noticeable differences in their daily lives. For example, individuals may have had difficulty with spatial orientation, memory, and problem-solving. They may have also had difficulty understanding speech and processing verbal instructions. Additionally, they may have had difficulty with organization and planning. However, without the written language, it would have been difficult to diagnose and identify dyslexia in individuals in this period.

Protein folding is quantum mechanical because it involves the movement of electrons and nuclei. The energy of the protein is determined by the quantum mechanical properties of the electron positions and the interactions between them. This means that the folding of the protein is governed by the principles of quantum mechanics.